激波诱导气泡破碎过程的数值模拟  

Numerical Simulation of Shock-induced Bubble Collapse

作　　者：邓树升[1] 谭俊杰[1] 

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《南京理工大学学报》2011年第6期811-816,共6页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(104776011;11072114)

摘　　要：为了对可压缩多介质流动中介质界面的剧烈变化过程进行模拟,采用发展的含拓扑结构改变的大变形非结构运动网格生成方法处理介质界面运动导致的网格畸变及拓扑变化。采用Riemann解构造出Lagrange界面来显式地追踪多介质界面运动。采用改进型虚拟流体方法构造介质界面的边界条件,在介质界面两侧分别求解守恒型的任意朗格朗日欧拉方法方程。对空气激波诱导圆柱氦气泡破碎过程、水中冲击波诱导二维气泡破碎过程进行了模拟,结果表明:该文基于非结构运动网格的多介质界面追踪方法可以有效地处理界面运动引起的拓扑结构改变。To simulate the dramatic changes of the material interface in compressible multi-medium flow,the mesh distortion and topology changes induced by the motion of the material interface are dealt with by using developed unstructured moving grids generation approach with large-scale deformation and topological changes.Lagrange interface is constructed by Riemann solver for tracking the multi-medium interface explicitly.Modified ghost fluid method is adopted to construct the boundary conditions of the material interface,and conservative arbitrary Lagrangian-Eulerian formulas are solved in each medial relatively.The collapse of the cylindrical helium bubble in air and the 2D air cavity in water induced by shock is simulated.The results indicate that the interface tracking method for multi-medium flow based on unstructured moving grids developed here is effective to handle the topological changes induced by the interface.

关 键 词：激波 气泡破碎 可压缩多介质流 改进型虚拟流体方法 任意朗格朗日欧拉方法 

分 类 号：O35[理学—流体力学]